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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167e52bdcee257d4e6bdff853f95a98d87d28568b5495bcfc7ef57d27e3ad6fd' 
  AND token = 'dOb82x3EsYEeEVgnnyS/GGu5LWXZKOWWA20FdtRoj9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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