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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd482b83fa9db9e9ed47f2f0b6d119af3f5cad51a01b8108b4960a1bc252e46f8' 
  AND token = 'bLfamBvz/156lzA23iM2ps9But9gS/1SsXyvq7pMteA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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