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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadf30bad481fe55fdc64e7fbea5aa747cc85520976c4aa2062cb454e808d0db' 
  AND token = 'riCcGoHDMdGJQExVy5xruuKN1cy1GH9MaWHUtiahcqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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