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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44020ce2b584cb24ec5d8844c98265e4066c1d7128715feee6d2203fbc2a462' 
  AND token = 'NwcojgxMW87RIytpfKaaQoaP2CM7+glBdutK6HoXXaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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