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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4b55ae29a9d53927faa69d244d21330a870b8289a9fd0e51d31906f999938a' 
  AND token = 'fF8l+recBSB3iptMjLuTGjwNtSTS21n6hTwCsbWnYa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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