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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb868069a3dc0ac4e2e271f35c9e7b10f991b660bf48808dda24a5297683c7d' 
  AND token = 'nvr57WCQnGjTa9w+4NajsgAClEZZz8mkjH1msBWrWLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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