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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13dd493902a3c49800754b32aea2d872923d3c9d193e28ee0c3010d7082d431a' 
  AND token = 'vUNrgZqfmt4xNhNtBZVczuggx5xAcEO/wt0z4EeGsQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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