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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cafe394df65cd219bd7fa9a87bedbfc2b8c40ab23a46b5b383447d7af213c7' 
  AND token = 'NLi/g1Nvp8h4NuBISrSCI78dvxHpFZiqhLt3uymzEIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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