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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1bcfb2aad88f744032fb2464c231905d1f6531835868d6a29260af641a1153d' 
  AND token = 'RIUlOj2nYrS6CQe28mWgmkfWzO4Dpl5T3msOa177DM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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