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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13078b6dcee6ec034e3e9b49267462e22c99519524153360bead08375ba0e10' 
  AND token = 'JPNDiwA47jagsEv9KQbE2UeykO12jeIGZ1OhX89B+u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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