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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8f545e8fedfd9ef762571814f8519f01c60d82e40839cd8b72127f8529531f' 
  AND token = 'HPB+ueoKsKmX3fcZCYrXOQSBoC1BdXcaAN5QKzFStdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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