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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261be67edbf34f747773358b9256d250a981d316adc4a9b291b392762a26ebd7' 
  AND token = 'XehKGi3xdWQM8J5QcZy46golyRchHCHNi4RglbeYc8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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