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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17d9fe11d39dd47d45950d714aabbcd85e9b35d5bb0f9ebf52f957ba5e01b37' 
  AND token = '3fm7ORc6af1LY/QkFTV87biKqbvINB98tS4aIdtK7PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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