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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f614a23e4b5f491c434e98b23770cff05c573e6325ae37d85e53c76a87ed6f69' 
  AND token = 'o+AJo4T4LeehgGb3kdoR/jV9dvML1eTTBFm5qNxM8rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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