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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7972afd35519d735d94e9a8c1acbdbe98b72f2d6fcefadd750de19d794dc3f4d' 
  AND token = 'L8biplySO1IvQ2HxI5MFBIADNpkgmevSOm6V5aGcw5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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