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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c976b26a7edcfcb853acba2932e2174509bd119a2efadb48f1ea4bd6f702ffa' 
  AND token = 'smhQDJI6yemc7MefSXFvhwt+51+kEOCy8DS4EzLgQ/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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