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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c058ac658e1fa402388ef9896f3358ef7b0095a835bea435b38781c4a6058d' 
  AND token = 'jw4fx3awrxeFcGH06qfLMdFRA/hIKjWeR+PlpFEKmmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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