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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4b58cf3242df56a5a287472a30bc67dbd2c7b5d8bd28b5d6195b3e0d143961' 
  AND token = '6OH7irrBYkq4howefIRzOprsdYVLyLvP4a7QtYPLgYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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