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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087636547c3cd4f17974ed3c3df6e29af1805e9b9e7ab062fae13d571526c71c' 
  AND token = 'dt4id8SCSldDMI0AC8MgmpZJbTrF7MScSN+oLT9SAdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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