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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c32d702c2c98428438ed5010821bf0df2f74892da8e14af14ac6e8508c51fd' 
  AND token = 'uHVsu+aty3SzAjFHgm+W4HnlBQ37juMC4MmC/mk64h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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