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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caeadad887f0c03b54960d6e1bc19cb965e20cdcfcd89d8a7cd23c12ae25d719' 
  AND token = 'Y20Lm7BdsjaFhvwMzT3TS0zJXGjKCkH8rQ0U4J1xMSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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