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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e49026278b341161d26428910b10504629b822ac92cca51c37a16495fa011b' 
  AND token = 'g7jo2Gbvckf6fJit5ZoQu8zmVDa9UuHzinow09xxq7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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