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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c8cc199894bf2ff1cdac1357459055008b8f5d29a375bbdc5dd6296471fafc' 
  AND token = 'q+QGqS3e9qLml1RnfsXCgveV3trrs91VHMu7d1R3wa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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