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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910205584612bb11db5db7e4122ea1a8a491a1d812df558f9f06433d7c234225' 
  AND token = '/IHNoeZsi3Rz7aQyBZSv7dT62mtK1vCNGNgrjXAt5Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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