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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e08b0cf8149a8e0f9632dddac42f16f20f963d8852c14463f5e4b8c7fd330b' 
  AND token = 'qDe7jGMF5Koyec14wUA9QmdHpI75Qo18t8e5GH0PPEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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