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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e042a43d412b9153093e5e63ea86290e4004b9a7c98a880960dff2dd161715d' 
  AND token = '/Ea76S82ZRyYzJ8Y3/rfvSJZvSN4MNSZ7RKXwF7IZWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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