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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753d08e7b9826da508d98a6152e1170601ae31ff109b9f6860b082b35b6647ed' 
  AND token = 'sa86WNK4O3cmJsCO1qmt7lTo64W2yB9LS85ilPYw47c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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