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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19168b654c85862f5aae50f8fb9977d74da4549b63d5edb7640b410ef24a84c5' 
  AND token = '3Sjtmf5sgwJ/U7O2nz38pU4lDCwFNBKc1TiUFumGtT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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