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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5853e52e0df7ab3a3318d2864207e97ed1cca7f7f2a67f1b0cc25f60b665547' 
  AND token = 'yuJdL0w3zaebcxkVdkwdP6S6njVIoDQQD4fDdGdpfDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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