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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ac4a364e0316b53bc20612b8bc249d495065ef67026ed72c62cdc4f583d9a2' 
  AND token = 'LMMNtQ619J7NMCAHfxP/68wlIU4NKhuwhCb1k+KmDo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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