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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37715e67a5d99b4ec6d25505ff8d7f3a5d7efe2aeea19eed6288f3bcc2b2ebf5' 
  AND token = 'PUXt9d6tEDPj6pH46wFXYJ0lA1Q2g0ovFmG/JOsGWfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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