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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb081ff289c31771370b9f1cf2c4b7190b490d3bcde3e4846631971d0664a247' 
  AND token = 'bc9Mh38m06t1mNzinaxmmlpTFPfq1XFYeT9GhMJjuSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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