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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a362a2a6cb4dbea2b82a40133bcf57d691b65be83fc06ed4c3af99e225134cf' 
  AND token = 'IjovhZ4xzUxdWexqxOfo3UB8wza2yq9Bzc9LhrR7B+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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