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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a51cc8737ec942fc2e8104ad4a3a7cda20ec114489a74749abdd41c16885f0' 
  AND token = 'Lhg/eCGjJJ5/8oU4TB6hSNeYtjJqU5b0wlpNUCTeI+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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