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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93966ba39d7d7d9100d630a4db06d3d6089dab09213fb08b123d687a05283d0' 
  AND token = 'GBFQ00aE15EoNZ6s/QirfZyY4SEikwMKWPhahtIeUyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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