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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83a6e8a99ff2a9de2823ef4590eb592e1225f5452268867d8e06bbc27c847a3' 
  AND token = '2tZTXgDJchtihrAnmkJ2E+HEPTH833Uf+AQuzf87nk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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