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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcbff57e4f5db8f5d465e308e166353260b1cd2bb46e162604e45a83b98100e' 
  AND token = '/j7rfizwLu4HUIvKpP3MNVXs1P5LNHR5rkbq/JpdPio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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