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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75588cb10fca1a43d80d823b894ca3b32e779224134075a47ebc2c0819175272' 
  AND token = 'oC8qIHm6SktbuXi3xnL9oMSD/pyc+O8AxsJaBIowaU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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