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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f19a561e8ec0db5e2599abc1f2bc31c3509c91f5a563db160ab8ac7a591a4d9' 
  AND token = 'YaEd12C3CdlG9DnHy6kGErKKC9RyvuG0x73PbixsL6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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