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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3cc6c6c1bb5c9cc0f6b35472fbec84a49007be1ec7933e8c526a503eed26c54' 
  AND token = 'EaMXmh97jW0QQUvF9miUvgn38wZBGH0YgqzF4ApvT3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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