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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef34e8ff084ab2cae2e71c9983fa65704e21e86b16cff6e9d79c1b268d9b2f99' 
  AND token = 'I32nRvm6bTRaFeDHPTBJxxEYfuNyfPj6BHveshfX+cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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