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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d26696188bbb3f44d066cfac35feaac9f79a7f39add60e615d05ffce2613e0' 
  AND token = '6tzq4qvQXbi/vJfiQyFT4ZdR8da2J6Yl7jnk/OKnPPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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