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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1ecfdc632e99b9ef38f292464f9e8589094156ba8892c9d4d07d3b10e0fc0c' 
  AND token = 'e4EyFFdO6TfvZSVf5FiezRPKlpsxX9nNrQvEnDcJ1i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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