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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90cd26cf52bf5ea40919e8469355a232c096d4ef78e187544c63e32c1d133509' 
  AND token = 'vF0xlV7w7ww4Ne51h2NXc3J+31TuNy7fLpWsun9J+Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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