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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca7f036c91f24fdea6eca797335a18df0e07eac7cf3489fab338f85ee789eab' 
  AND token = 'JyR3opcIpU7LxZvXMOtigLhqpwauGP1d2TrD+/q+ZX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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