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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cfc659216e6f794e982bfefac4598c11c8f007524a8c4df2f90ef7000042be' 
  AND token = 'MID8b2vJkj70T4Odv2aOZAC+Xp8k9LB/+7T2Rhpnegk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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