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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915c9bb7f3161e3c07e430de4c0b43d668417ab6da6774865f750e58a83977d7' 
  AND token = 'gQUclATmvP4rTC8f5QlwpGGC+G+NxOjEGPFxKffzMjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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