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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6072312bde01b3d977d7dd76a670e22df4109625a6b10bba090a270a76ace56d' 
  AND token = 'Ln3WtRDMwUiTrE4YlXt33lQFnZIkp3su264kam52aTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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