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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02202c161bd54640818de9eb398e8d7e557efee1f1892d1330a450e514f846d' 
  AND token = '+gHL+JLzz51x42i2X1g9kzrI4Y2IIy3uEjema6Dj0TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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