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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2b35b61bc6703a7b2e955bf63eb81cb3da0a455511204c3f8710f2a90360c8' 
  AND token = 'JbmvtrXYAtqQP7hWxE1kA9fNodIe9BfexzPfUVq/zA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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