SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fc8e79379b5ddc49491258a617420c55622f0d3a1b950c8ea363d3c2644c63' 
  AND token = 'JSyyZzugJAOWpeA2Fj1iPAG+nUkPw60/pbTyPYLAzU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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