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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6662d3e934e74041f5d0aaa4f870c770f8a21c92fd6c60cd0deb8b51c06caa0b' 
  AND token = '1ebeRZIrKfrNngANnaNbqH3+/hodduWnMgR2ZQYrYrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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