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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89746d6b01f077d4999aa933dce9d17d86d74aac44de7f70162987f2dd542dd' 
  AND token = 'utNseVsLFD+yP0ASEs0AX60NAOAz/4PRPA1k8cNm/wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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