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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87b2898f047b4d6add0ddd8e1f5e5b30e68818257d8c28467737fae7834cc53' 
  AND token = '7R1/r+7aTY/NHMzP/GNyPtABddtrFqOjEQmeSUO/jX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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