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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa64d06799dfee4cccc8c3ca9ef536a23fc133b0e4153e6b05373646744e48c7' 
  AND token = '6upM7WlmQmTMOEvprTgBxtJCZE7bAR4mO8OWUeiPvHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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