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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d38516a5cd98c63508c67900d3cc677292b707780433563128bd16543eeb04e' 
  AND token = 'WUH63mB002KRVSt46uJdl/Sw8+wfOql+u9oKzfgYNNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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