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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc681b2777d161dbd296f3be0d7e1d6c4fd76c27a1ff41f0b59ba93815dac95' 
  AND token = '98idL5idm9mpP/HGS6FY/k7CvLz+aA6/L5MBB+3SktA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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