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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3504cb62a2667c62ab6be1a491bb3d292f3184dad7fad5a2364a9f2178791aba' 
  AND token = '1Bnp1kuB1+xWfcS2v0/jrNA1jrFMX2F+V2AFNgnr9Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}