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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a977bd943043d9c88717f34c0ae4cc27c878a62a0786d086aa07252a38d4711' 
  AND token = 'SRR/LmCEQ/Pl/51fGQkXGIzJMOAZdcx7ddgV6aYlQNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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