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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f06e199c827cbeea8321feb34716437c226e1d715f4852a33125a69e88f3da' 
  AND token = 'mv8NcC6nn4lR6D2szq5aPvEM35B5/btMhSMUdBelVPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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